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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Oliver 88 Diesel Questions

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Greg Shirley

05-14-2008 16:07:16




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I'm getting very frustrated trying to get my Oliver 88 Diesel back together and running and starting to second guess myself. Here it goes:
I had a perfect running Oliver 88 Diesel this time last year but when mowing with it the Camshaft Gear decided to bust. I just recently found a gear for it. I had it installed onto the Camshaft. I re-installed the Camshaft and Lined the 2 "C" marks up between the Camshaft and the Crankshaft gear. Then I was told I had to time the Injection pump. I removed the pipe plug (energy cell)from the side of #1 cylinder to try and figure out when the #1 cylinder was on it's compression stroke. I felt compression out of that hole so I assumed it was correct. Then I turned the flywheel a little more until the FP timing mark lined up in the flywheel with the timing pin. At that point I checked my Injection pump timing thru the timing hole and the window on the side of the pump. It appears to be lined up. I made sure there was fuel getting to the injection pump and there was. Do you think there could possibly be some air in the injection lines keeping it from starting or something? It will fire with some ether but then die once it's all gone. This thing ran Beatiful before the Cam gear busted. I'm ready to cut it up. Just kidding. Any suggestions to try next? Thanks.

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C. W. Tesch

05-15-2008 07:35:55




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 Re: Oliver 88 Diesel Questions in reply to Greg Shirley, 05-14-2008 16:07:16  
1. Is white exhaust smoke seen while cranking? Smoke indicates that fuel is being injected into the cylinders. No smoke means no fuel--bleed the low pressure system first, then loosen lines at the injectors and crank until fuel without air bubbles is bleeding from lines.
2. The 88 and S88 used an American Bosch model PSB injection pump. This pump is driven at crankshaft speed (most other pumps at cam speed). This means that there is a 50% chance in injecting on the exhaust stroke even with FP mark on flywheel and timing mark on pump drive in alignment. Just remove the timing cover in front of the injection pump, remove two bolts securing the gear, then turn crank shaft one full turn until FP is again aligned. Install timing bolts and try to start.

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Greg Shirley

05-15-2008 08:25:10




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 Re: Oliver 88 Diesel Questions in reply to C. W. Tesch, 05-15-2008 07:35:55  
Yes, white smoke is coming out while trying to start. That is good info to know. I think I will try and turn the flywheel like you said one full turn and try to start. It sure can't hurt anything. Thanks for this info it all is quite helpfull.



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Oliver Puller

05-14-2008 16:57:39




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 Re: Oliver 88 Diesel Questions in reply to Greg Shirley, 05-14-2008 16:07:16  
If the camshaft gear broke while the tractor was running, it is quite possible that it has some bent valves. It has been a long time since I seen an 88 diesel head off the tractor but most diesels don't have much space between the top of the piston and the valve. If the camshaft gets out of time with the crankshaft(like when your gear broke) and the valves are open when the piston comes up, the piston will hit the valve.

Also, I know you said you feel compression through the energy cell hole but is it possible that you timed it when the #1 piston was on the exhaust stroke instead of the compression stroke? If it is on the compression stroke, you need to turn the crankshaft one full turn and then time the pump there.

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Greg Shirley

05-14-2008 19:42:24




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 Re: Oliver 88 Diesel Questions in reply to Oliver Puller, 05-14-2008 16:57:39  
Well I do know that after the gear broke I turned the motor over several times until I figured out what had happened. I did have 3-4 bent push rods as well I had to replace. I was hoping that it was just the pushrods and not the valves. If it was on the exhaust stroke I wouldn't feel any pressure out the energy cell due to the valves being open correct?



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